Return Bus Character Overrun Count (Sub-Function Code: 12H) - Mitsubishi Electric MELSEC iQ-R Series Reference Manual

Return bus character overrun count (sub-function code: 12H)

Operation description
To the master, reads out the number of times the request message size exceeds the upper limit.
Request message format (from master to slave)
Function code Sub-function code
08H (0012H)
(H)
Response message format (from slave to master)
■ When completed successfully
Function code Sub-function code
08H (0012H)
(H)
Returns the count value of the buffer memory listed below to the master.
• 'Character overrun count' (Un\G32514/Un\G32578)
Refer to the following for the counter descriptions, count range, and count clear methods.
Page 21 Checking communication conditions using a diagnostic counter
■ When completed with an error
Function code Data
Exception code
88H
Data
(0000H)
(L) (H) (L)
Data
Bus character overrun
count value
(0000H to FFFFH)
(H) (L)
(L)
3 MODBUS STANDARD FUNCTION DETAILS
3.8 Diagnostics (FC: 08H)
3
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